what is the audibility requirement as per NFPA in public areas.
5db above maximum db is accepted .How is it measured
Not sure your question
Prefered when building is in normal use, not quiet.
184.108.40.206* To ensure that audible public mode signals are clearly heard, unless otherwise permitted by 220.127.116.11 through 18.104.22.168, they shall have a sound level at least 15 dB above the average ambient sound level or 5 dB above the maximum sound level having a duration of at least 60 seconds, whichever is greater, measured 5 ft (1.5 m) above the floor in the area required to be served by the system using the A-weighted scale (dBA).
By using a db meter if I measure the maximum sound db in normal working condition is 50db and in alarm condition I got a value of 56db.is it correct as per nfpa.can I go ahead with this process
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I normally use 15 DB above ambient
I cannot talk to the 5db
I am thinking you need to meet the 15 db
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